Fix RSS enclosure media types

[tannerlinsley]

Evidence

The RSS route hardcoded every blog image enclosure as image/png. Among the current 50 published posts, the feed includes 24 PNG, 13 JPG, 4 WebP, 2 JPEG, and 1 SVG header images. That left 20 enclosure media types inconsistent with their URLs.

Change

Derive the enclosure media type from the image extension, including query strings and fragments, and use application/octet-stream for unknown extensions. Add focused regression coverage for the supported formats and fallback.

Impact

RSS consumers now receive media metadata that matches each blog header asset. Enclosure URLs, post content, and site rendering are unchanged.

Validation

• pnpm test — TypeScript and type-aware lint clean; 124 tests passed, 1 environment-gated smoke test skipped
• git diff --check
• Commit hook reran formatting and the full test gate successfully

Risk

Low. The change only corrects RSS enclosure metadata; it does not alter asset URLs or response bodies.

Summary by CodeRabbit

• Bug Fixes

  • RSS feeds now report the correct media type for images based on their file extension.
  • Image URLs with query parameters or fragments are handled correctly.
  • Unknown image formats use a safe fallback media type, improving compatibility with RSS readers and other feed consumers.

• Tests

  • Added coverage for common image formats, including PNG, JPEG, WebP, SVG, and GIF, as well as unsupported extensions.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	tanstack-com	7a55af7	Commit Preview URL Branch Preview URL	Aug 10 2026, 05:48 PM

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 38aead41-a76c-417a-819c-1e14de4fa786

📥 Commits

Reviewing files that changed from the base of the PR and between 878187c and 7a55af7.

📒 Files selected for processing (2)

• src/routes/rss[.]xml.ts
• tests/rss.test.ts

🚧 Files skipped from review as they are similar to previous changes (2)

• src/routes/rss[.]xml.ts
• tests/rss.test.ts

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📝 Walkthrough

Walkthrough

The RSS route detects image MIME types from header image extensions, ignores query strings and fragments, and uses application/octet-stream for unknown URLs. Tests cover supported mappings and fallback behavior.

Changes

RSS image media types

Layer / File(s)	Summary
Image media-type detection src/routes/rss[.]xml.ts, tests/rss.test.ts	getRssImageMediaType maps supported image extensions to MIME types. Tests cover common extensions, URL suffixes, and unknown extensions.
RSS enclosure integration src/routes/rss[.]xml.ts	RSS enclosure type attributes now use the detected image media type.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change to RSS enclosure media types.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/fix-rss-enclosure-media-types

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@src/routes/rss`[.]xml.ts:
- Line 16: Update the extension detection expression in the RSS route to inspect
only the URL pathname, excluding query parameters and fragments before matching.
Preserve the existing lowercase extension behavior and supported-type lookup,
while ensuring dotted values in queries or fragments cannot determine the MIME
type.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 2667c399-120e-4214-859c-e03afe3c0bab

📥 Commits

Reviewing files that changed from the base of the PR and between 19b0f00 and 878187c.

📒 Files selected for processing (2)

• src/routes/rss[.]xml.ts
• tests/rss.test.ts